Ab/Ag energetics

I am interested in the physics of antibody-antigen complexes.
None of the biochemistry and immunology books I've consulted
has any real parametric data, and I'd appreciate a pointer.
Four questions come to mind:
1 - What is the range of binding energy that holds an antibody
antigen complex together ?
2 - What is the relationship between this binding energy and
the reaction rate constant K, i.e.:
K
Ab + Ag ---> AbAg
<---
2 - Is the primary interaction between antibody and antigen
of a dipole-dipole nature ?
3 - What is the physical size of a typical IgG antibody ?
Thanks in advance.
Ed Stokes
ebstokes at crd.ge.com